html {
    font-size: 12px;
    min-width: 35rem;
}
.top_nav {
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 999;
    .top_nav_container {
        height: 3.75rem;
        min-width: 27.08333rem;
        background-color: #fff;
        font-size: 1.25rem;
        line-height: 3.75rem;
        border-bottom: 1px solid #ddd;
        .container_ul {
            margin: 0 auto;
            max-width: 50rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: relative;
            .logo {
                padding: 0 1.66667rem;
                .logo_img {
                    width: 2.16667rem;
                    height: 2.16667rem;
                    margin-right: 0.66667rem;
                    background-image: url(../images/logo.png);
                    background-size: cover;
                    background-position: 50%;
                }
            }
            .nav {
                .nav_ul {
                    display: flex;
                    justify-content: space-between;
                    align-items: center;
                    li {
                        margin: 0 0.66667rem;
                        color: #90959b;
                    }
                }
            }
            .zhanwei {
                flex: 1;
            }
            .dowload {
                background: #fb7299;
                border-radius: 1.25rem;
                font-size: 1.08333rem;
                color: #fff;
                padding: 0 1.33333rem;
                height: 2.5rem;
                line-height: 2.5rem;
            }
        }
    }
}
.content {
    padding-top: 3.75rem;
}
